Subaru Crosstrek Serpentine Belt

[@Hesh_Ghost]

I replace my alternator, battery light and negative battery sensor/terminal and I have my battery light on. I suspect the tension for the serpentine belt is too loose. Do you have any recommendations on how to test this or how to tighten the tension?

[@Subariblet]

You might need to put in a new tensioner pulley. It would be fairly cheap to do so. If it’s bad, your serpentine belt will be loose.